<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
</head>
<body>

</body>
</html>

<!-- <script type="text/javascript">
	var i = 0;
	var sum = 0;
	while(i<100){
		i++;//i++所处的位置是跟初值和末尾值有关系
		if(i%2==0){//判断i是不是偶数
			sum = sum-1/i;

		}else{
			sum = sum+1/i;
		}

	}
    document.write(sum)
</script> -->

<!-- <script type="text/javascript">
	var year = 1000;
	while(year<=2000){
		if(year%100!=0 && year&4 ==0 || year%400==0){
			document.write(year+"<br/>")
		}
	    year++;
	}
</script> -->

<!-- <script type="text/javascript">
	var sum = 0;
	var i =1;
	do{
		
		sum+=i;
		i++;

	}while(i<=100)
	alert(sum)
</script> -->

<!-- <script type="text/javascript">
	var sum = 0;
	for (var i = 1;i<=100;i++){
		if(i%2==0){
			sum = sum-1/i;
		}else{
			sum = sum+1/i;
		}

	}
	document.write(sum)
</script> -->

<script type="text/javascript">
	for(var i = 1;i<=10;i++){
		for(var j = 1;j<=i;j++){
			document.write("〇")
			
		}
		document.write("<br/>")
	}
</script>